Warp stop motion contact bar and drop wire



Aug. 23, 1932. 0, v, PAYNE 1,873,019

WARP STOP MOTION CONTACT BAR AND DROP WIRE Filed July 9.1930

'HIWHIHIH A 770/?NE Y5 Patented Aug. 23, 1932 UNITED STATES? OSCAR. v. PAYNE, or wononsrne, MASSACHUSETTS, assieivon "r oRo Pron a1- PATENT. j OFFICE KNOWLES LOOM worms, 0F WORCESTER,IMASSACHUSETTS, A oonronarron on MASSACHUSETTS WARP sror MOTION coiv'r'AoT BAR nivnnnorwrnn Application filed July 9, 1930. Serial No.'466, 705.

This invention is a continuation in part of my copending application Ser. No. 350,401 and is concerned more particularly with certain relations existing between the drop Wire and contact bar of an electrical warp'stop motion.

1 The warp stop motion to which my invention relates operates electrically with contact bars, one for each bank of drop wires, and the wires are provided with slots in thelr upper portions through which the bars pass. Each bar is formed of two electrodes one of which is grounded and acts as a support for the live electrode insulated therefrom. I find it convenient to locate the exposed surface of the live electrode within the outline of'the grounded electrode, this construction requiring a lateral motion on the part of the drop wire to establish electrical connect on between the electrodes. The lateral 1110131011 is brought about bv the co-action of a lobe on the drop wire positioned to engage a longitudinally extending cammlng r1bon the grounded electrode. As the drop wlre falls thetlobe is moved laterally by the rib and the drop wire must be provided with clearance' above the lobe to permit the lateral motion. a V

In drop wires having slots of any appreciable width in their upper portions there is the chance that one drop wire will move into the slot of an adjacent wire and support the latter even though its warp be :defective. The harnessing of the warp requires that certain threads and their drop wires be' raised while others are depressed. At the beat-up of the lay all of the threads are subjected to. a temporary increased tension which may result in a slight upward movement of the drop wires, some of them moving farther than others. In each of these instances a condition exists which permits drop wires to become interlocked. Also, at the time of warp fault the drop wire of the defectivethread will be down on the bar, but will be raised when the weaver corrects the fault, and this raising might cause interlocking. I l y 1 Various attempts have been made to form drop" wires of different styles of motions either with rounded tops o'riwith'j'extended upper ends in order toprevent the. inter-' locking. The drop wire must always be so proportioned that the major part of its" weight lies below the surface which rests on the warp in order to retain the drop wire in uprightposition, and this consideration lime its the height of the solid part of they drop wire above the slot. It is an important object ofmy present invention to place the previously mentioned lobes in, such a posi tion relatively to the contact bar that when a drop wire is in thelowest position it can occupy, that is, supported by the contact bar, the upper end thereof will be in substantial horizontal alignment with the lobe of an ad- "jac-ent drop wire which maybe raised. In

this way I prevent a low drop wire from having an upper ;corner thereof pass into the slot of the ad] acent drop wire. p

- With the objects indicated above and others which will appear as the description proceeds, my invention; resides in the combinationand arrangement of parts hereinafter described and set forth in the claims. I

1 In the accompanying drawing, wherein a convenientembodiment of my invention is set forth, I y 1 Fig. 1 is a vertical central section through a warp stop motion employing my improved supporting. and spacing units 10 the right hand one of which maybe engaged by a nut 11 on the rod efieotive to clamp said units against an end plate 12 movement to theleft of which is resisted by nut 18 on the rod. Each contactbar, designated generally at B, has an outer inclosing sheath or grounded electrode 14 having a vertical wall 15 in which is formed a longitudinally extending rib 16.

The top and bottom edgesof the grounded electrode are bent horizontally andv then downwardly and upwardly, respectively, as

the grounded electrode, that is, a'line joining the right hand surface of'the bent ends 17 and18. as shown in Fig. 2 will rightof the surface 20. Suitable insulating material may be provided to main 'tain f the:

electrodes in electrical separation.

The matter already described is substantially the same as that set forth ingmy' afore- .7

said application and'so far as this invention is concerned it is significant'to note that the top folded over edge 17 of the grounded electrode projects beyond the live surface 20, so

. that'access to the latter by a body falling'past said grounded edge 17 is afforded only by a lateral motion to the left as viewed inFig. 2

on the part of the falling body;

. Thedrop wire D formlng the subj ect in at ter of my present invention has .1 an open slot 30 in the bottom portion thereof to receive a warp thread and has a closed slot 31 in the upper part thereof, therebeing a hole 32 punched between said slots for the purpose of reducing the weight of the drop wire.- The slot 31 has lower and upper portions 33 and 34, respectively, which are separated by lobes or similar-inwardly extendingcamming projections 35. The right and left hand edges of the lower part of the slot may be defined by walls 36 and. 37, respectively, while the corresponding walls of the upper part 34 maybe defined bywalls 38 and 39, respectively; The walls 37 and 39 are in alignment, though not necessarily so, and this relation is also true of the walls 36 and 38. It is im portant to note, however, that the space be tween the upper walls 38 and 39 is greater than the distance separatinginearest parts of the right and leftha'ndlobes35as designated by points 40 and 41, respectively.

' In operation, the warp WV will'normally support the drop wire so that the lobes are above the top edge of the bar, thereby keeping the surface 20 electrically separated from the grounded electrode. When a drop wire falls the lobe having point 41, for instance,

will engage the rib 16 to move the drop wire to the left, the corresponding point 40 of the :otherlobe havin previously fallen to a point below the round e'd edge 17 of the inclo'sing electrode. The right hand lobe will therefore move under the upper righthand edge of the bar, and the wall 38 will approach the bar. This necessary lateral movement of the wire is possible because the upper part 34 of the slot is of sufficient width. Current may then flow from the live electrode through the right hand lobe, through the drop wire, through the opposite lobe and rib 16,to the grounded electrode.

The drop'wire is preferably symmetrical about its'vertical central axis so that it may pass-to the }tion. From aninspection of Fig; 2 it will beseen that when a drop wire, suchjas'the' one indialso be seen thatthe lobes which act to eflect a the points 40 and 41 are preferably in horizontal alignment when the drop wire is upright; ,As shown herein the-lobesare syme metrical about 'a-v horizontal. axis passing through them, but this is not a necessary relacated in dotted lines, is in the lowest position which -it canoccupy because of the engagement with the detector bar, the top edge thereof Will'lieopposite portions of the lobes 35 and the laterally offset position of the detector which might otherwise permit it :to 'become interlockedwiththe adjacent drop wire shown-raised in full lines, is prevented by said lobes. As the weaver ties a-broken warp there is therefore no likelihood that the corresponding drop wire will become entangled with either of the drop wires adj acent thereto a'sitis-raised.

7 From the foregoing it will be seen that I have provided a drop wire and contact bar for an electrical warp stop motionso propor tioned that the drop wire may have the necessary lateral movement to electrically connect theinsulated electrodes ofthe bar. -It will lateral movement of-one drop wirewill in an other drop wire occupy'a higher position serving to prevent interlocking of the drop w1res.-'

.Having thus described my invention it'will passes, lobes formedoneach 'drop wire and extending-into the slot thereof, the lobes ofa dropwire when in highest position attainable-relatively to the bar lying near the top of an adjacent drop wire in the lowest position attainable'relatively tothe bar to prevent the top of the second dropwire from entering the slot of the first drop wire. 2; In an electrical warp stop motion, a conto the details herein disclosed, but what I its tact bar, a plurality of'drop wires having vertical slots through which the bar passes, lobes formed on each drop wire and extending into the slot thereof, a longitudinally extending camming rib on the' bar to engage and limit downward movement of a fallen drop wire, the lobes of a drop wire in normal posit-ion being placed to engage the top of anadjacent fallen drop wire and prevent the latter from entering the slot'of the drop wire in normal position.

3 ..In an electrical warp stopmotion', a

contact bar, drop wires having slots through which the bar extends, inwardly projecting cam portions on each of the drop wires extending into the slots, a camming rib on the bar to engage a cam portion of a fallen drop wire and move the same laterally to efiect electric contact, the cam portions of a drop wire in normal raised position located to engage the top of an adjacent fallen drop wire to prevent the latter from entering the slot of the raised wire. v 4. In an electrical warp stop motion, tw

electrodes one of which overhangs the other,

a drop wire with a slot through which the v electrodes extend, a pair of lobes on the drop wire extending into the slot, and means to engage one lobe as the drop wire falls to move th other lobe under the overhanging elec-' trode and into engagement with the other electrode, that part of the slot above the lobes being wider than the distance between the lobes, whereby a lobe is capable of movement under the overhanging electrode.

In testimony whereof I have hereunto affixed my signature.

OSCAR V. PAYNE. 

